Tested building the compression module by linking to system-wide CFIT…

…SIO installations of a few different versions. Added some stubs and comments to the setup.cfg explaining how to accomplish this if desired.
git-svn-id: http://svn6.assembla.com/svn/pyfits/trunk@1922 ed100bfc-0583-0410-97f2-c26b58777a21